Switching apparatus



April 28,19z5. 1,535,390

J. H. WYATT SWITCHING APPARATUS Filed Feb. 17, 1923 4 sheets-sheet 1 INVENTOR ATTORNEY April 28, 1925.

J. l-l; wYAT-r swITG'r/II'NG APPARATUS Filed Febf 17, 1923 4 Sheets-Shet 2 INVENTOR fm MW BY.'

UTTORNEX.: l

April' 28, 1925. l 1,535,390

- J., H. wYATT swITcHING APPARATUS I vFiled Feb. 17, 1923 4 Sheets-Shee't 3 Amma,1925. 1,535390 J. H. WYATT SWITCHING APPARATUS Filed Feb. 17, 1923 4 Sheets'wShe'et 4 NV TOR i ATTORNEY Patented Apr. 28, `1925.

UNITED STATES PATENT OFFICE. 1

JAMES H. WYATT,

OF TREDYFFRIN TOWNSHIP, PENNSYLVANIA.

SWITCHING APPARATUS.

Application filed February 17, 1923. Serial No. 619,577.

To all whom it .may concern.'

Be it known that I, JAMES H. VVYATT, a citizen of the United States, residing kin Kirklyn, Delaware County, State of Pennsylvania, have invented certain new and useful Improvements in Switching Apparatus, of which the following is a specification.

AMy invention relates to switching or automatic circuit breaker mechanism utilizable for controlling or interrupting circuits carrying current for electric lighting, power or other purposes.

My invention resides in single pole or multi-polar switching or circuit breaker mechanism kof the non-closable type, characterized by the utilization of an overtravelling toggle for locking the switching` .or circuit breaker mechanism in normal, generally circuit closing, position, in combination with a latch for detacliably connecting an operating member with the toggle structure,v the latch being actuated to rob the operator of control upon attempted closing of the switch or circuit breaker mechanism during existence of an abnormal or undesired condition; and further characterized, in the case of multi-polar switching or circuit breaker mechanism, by the utilization of a single latch co-operating with the toggles of the different poles.

My'invention resides furtherin a multipolar switching or circuit breaker mechanism of the non-closable type, and more particularly of the character above referred .to7 in which the armatures or movable systems of a plurality of tripping magnets control a tripper bar or member common to the ypoles and utilized in actuating the latch which normally connects the operating member with the switching mechanism; and my invention resides in stiucture of this character in which the magnets serve to. trip or release the movable contact members'of the poles with which they are associated and of any other pole or poles whose movable contact member or members is or are coupled.

My invention resides in the features of structure and combination hereinafter described and claimed.

For an illustrationof one of the forms i;

mechanism in circuit closing position.

Fig. l is a bottom plan view of part of the structure shown in Fig. 3.

Fig. 5 is a side elevational view of'p'art of the structure of Fig. 3 withjtlie partsiin open circuit position.

Figs. 6 and 7 are side and end elevational views, respectively, of the latch.

Figs. 8 and 9 are, respectively, side and plan views of the latch actuator.

Figs. 10 and 11 are, respectively, side and plan views of the operating member.

Fig. 12 is a fragmentary side elevational view, partly in section, of parts of the tripping mechanism. A

Figs. 13 and 14 are, respectively, plan and side views of a toggle link.

Fig. 15 is a fragmentary side elevational view of a group of elements.

Fig. 16 is a fragmentary frontA elevational view of another group of elements.

'Referring to the drawings, 1 is a base of suitable insulating materialen which are mounted, as indicated in Fig. 2, three poles,

A, B and C, 'of 'a multi-polar automatic Vcircuit breaker mechanism, whose inovable contact members are mechanically connected to cause movement of them in unison with each other, it being understood,'however, that some features of my invention are utilizable in connection with single pole switching or circuit breaker mechanism. i

Each of the poles comprises main terminals 2 and 3, adapted to be engaged and bridged by the movable laminated Contact member 4t secured upon the'arm '5 pivoted at 6 to a bracket or housing 7 secured to and outstanding from the base 1. Pivoted to the arm at 8 is a toggle'link 9, pivoted at to the toggle link 11 pivoted at12 to the Y bracket or housing 7, land having a. portion 13 extending outwardly beyond the'pivot 12, Figs.' 13 and 14.l The members 111 of the several poles are mechanically coupled by the bar 14, preferably of insulating material, caiisiiigtlie toggles Vand movable conta-c members to move in unison with each other or fas an unit.

The base 1 and the mechanism carried thereby are support-ed, and carried by the rear box or housing 15, which maybe of sheetv meta-l,- and which is itself secured to any suitable support by screws 16, the box 15 beinga supportrtor the base 1 and the parts carried thereby and for the housing 'H, which encloses the switching mechanism and carriesoperating Vor control mechanism Y therefor. Y

Communicating 'with the interior ot the b oX 15 Ais the `pipe or conduit' 17, through which extend from the exterior into the bo);

V415 the three insulated supply conductors 18,

19 and 20, 'connecting V,Within the housing 15 with the studs V21, `which extend through lthe -base 1 and connect With the upper terminals 2v or" the several poles, as A, and'C. Y `f Vlith each ofthe: lower terminals A3 of the outside poles or arms A. and C is connected VVone terminal o't an overload tripping coil Y lowerA terminal 3 of the middle Y arm or breaker'B, extend to the exterior of the box 15`thi'ough the pipe or conduit 27 `Associated iv'ith each tripping coil 22 is 1a corestructure with which coi-operates thev armature 28, pivote-d at 29, and provided," ,when desired, Vwith a start-delaying device of the sucker type comprising' a cup 30 Within Which is themovabl'e sucker lelement 31 connected bv linki32 to the armature28.

The toggle links 9, 11' form, 'o-re'achpole,

af toggle which overtravels, in the sense that 5o beyond oracross a lineconnecting the centhe' center of theV pivot 10 moves upwardly ters ofvpivots 8 and 12, until the extension 13 of; the toggle .link 11 comes into Vcontact with bracket -or housing 7, thereby forming.

a lock Vwhich holds the movable con act 'mem-V bers 4' under vtension in circuit closing posif t'ion,',all as indicated-in Fig. .1.'

Associated-With each overloadV tripping magnet is a member 33, Figs. 1, 2 andi12,

which' upon attraction'otthe armature 28,

upon overload, is'striick at its loire-r end by Athe armature 28,' causin-gmember tomove upwardly andengage the tail 13b of the toggle linklli. causing its rotation in counter-clockwise direction, las viewed in Figs. 1,

`with Which co-acts 3 and l2, causing the pivot pin 10to move in counter-clockwise direction across the line and collapse and thereby cause or alloWt-he movable contact Vmember 4 by gravity ora spring (not shown) to rotate in clockwise.V`

direction about its pivot 6 lto open circuit position. A V

Each of the members 33 is provided with al pin 34, Figs. 1, 2 and 12, Vupon'ivhich is looselyhung or pivoted the tripping bar 35, preferably of insulating material, eX-` tending across in front otthe threeV poles, as indicated iii Fig. 2. Y, Y Y

' Fivoted at 12 to the bracket orhousing 7 joiniing 'the centers otpivots 8 and 12, so i Y causing the toggle to become undertravelled associated with the middle pole orbreaker Fi is the operating member or lever 36, Figs. 10 and 11. which niaiv be formed 1n two a v pai-ts `ioined by the saddleor member 3i',

described. f Y

-Pivoted upon the operating member or vlever 36 at 38 is the latch VA39 having the tails 4G `and 41 and the lug 42,*in'the path VVot" which latter is a. pin 43,'carried'by Vthe the actuator hereinafter.

member '36, limiting counter-clockwise ro-tation of thelatch'39, as viewed in Figs. 1, 3

and. Surrounding Athe pivotal hub 39301? Vthe latch 39 is Wound a spring 44 acting upon the ylatch V39 to tend to rotate the same in counter-c-loclliwise direction, asvieWed -inl Figs. 1, 3 and' 5. one end or the spring44` engaging Ythe tail. 40 vand against the pin 43.

Secured to the bar 14 Vand therefore to the. toggle membersll is: the member or Vthe other resting Iabutment 45. Whose endV is adapted toI be las indicated engagedrby the/hook latch 39, in Figs. 1 and 3. Y Y Y n Pivoted at 2l-G'to thebracket or housing`7 of the Ymiddle pole orarin B is jthe latch actuator 47,disposedY beneath the tail'41r of the latch 39 and acapted to be moved in counterclockivise direction by upward ymovement ofthe tripper bar 35,,Which-is disconnected `from but: supports latch 'act-iiator 47 and lies in the notch-4"a. Y ,Upon upward n'iovement of the tripperbiar'ii Vthe latch actuator 47 engages the Vtail 41 ofthe latch 39 to move the same in opposition to lio.

spring 44 inA clockwise direction about' its pivot 38, as viewed in Figs. 1, 3V and-5, to disengage ther latch 39 from the abutment 45,.vhicli latterv is `in etiect iixedly coune-cted to iall ot' the toggle members 11IV of the ditterentV poles.

Disposed uponl the base 1 beneath the rn'id-l Y Velle pole B is an underload or-low or Ilovoltage magnet having the windings 48, Vasf sociated ivith core structure having the'poles f or housing 7 at 46.l A tension spring52,

Fig. 1, is connected atits' one end .tothe end 49, VWith which coeacts the armature 50 yse- 'cured'to the lever v51 pivoted-to the bracket y of the lever 51 beyond the pivot 46, and its other' end at 53 to a stationary abutment, the tension of the spring 52 being exerted in such direction as to move the armature away from the poles 49. lVhen the magnet windings 48 are energized, the armature 52 is held in attracted position indicated in Fig. i, in opposition to the tension of spring 50. Upon occurrence of low voltage or no voltage the spring 52 moves the lever 51 in counter-clockwise direction, as viewed in Fig. 1, and the pin 54 carried by the lever 5 1 engages the tail of the cam 55, Fig. 1, rotating the same in counter-clockwise direction about its pivot 46 and causing its free end at the right to engage the roller 38a on outer end of pin 38, or, in any event, the operating lever'36, causing the latter to rotate in counter-clockwise direction upon its pivot l2.v as viewed in Fig. l, thereby lifting the latch 39 from the abutment 45, and the member 36 also engagesV the under side of the iianges 13;L of the toggle member l1 of the middle pole or arm B, rotating it in counter-clockwise direction, as viewed inv Fig. 1 Athereby carrying the toggles of all the poles backward across dead rcenter to undertra-velled position, whereupon they collapse and all the contact members 4 move to open circuit position.

The front wall of the housing-H may be fixed with respect to the housing, as indicated, or it 'may be a pivoted door of the housing. In either event, as indicated, there ris secured upon the housing wall upon thel interior thereof the bracket 56, in which is pivoted the rotatable shaft 57, upon which within the housing H is secured the actuator 58 having the upper and lower lugs or hooks 59 and 60; the former, upon counter-clockwise rotation of the actuator 58, as viewed in Fig. 2` engages the portion 37 of the operating member or lever 36 to move'the same in clockwise direction about its pivot 12, as viewed in Figs. 1, 3 and 5. And upon movement of the actuator 58 in `opposite direction the lower lug or hook 60 engages the under side of the member 36, rotating it in counter-clockwise direction. so freeing the latch 39 from the abutment 45, if the switching mechanism is in circuit closing position, Figs. l, 2 and 3, and thereafter rotating all the toggle members 11 in counter-clockwise direction to bring the toggles to undertrave-lled position, whereupon the movable contact members move to open circuit position.

Secured upon the shaft 57 on the exterior of the housing H is the operating handle 6l for imparting to the actuator 5S'the rotative movements in opposite directions above described.V

Secured to the housing H is a lug 62 havinfr a hole 63 through which may extend the hasp G4 of a padlock G5, the hasp 64 passing through an open notch or groove in the lug G6 on the operating handle member 61, whereby, until the padlock 65 is unlocked and hasp 64 removed, `the actuator 58 cannot be effectively moved.

As indicated in Fig. l, there is attached to and movable with the bar 14 a forwardly extending arm G7, which carries on its forward end an indicating or signaling element 68, `which partakes of pivotal movement about the pivot 12, moving to different positions according as the circuit breaker mechanism is opened or closed. There is provided in the front wall of the housing H an opening, or an opening covered by glass or other transparent material, through which the indicating member 68 is visible, the position of lthe member G8, or its presence or absence from a position before the opening, indicating to the operator the position of the circuit breaker mechanism within the housing.

Outstanding from the base l, within the housing H, and disposed between the upper porti-ons of the poles or arms A, B or C, are the barriers 69, ofinsulating material, to prevent arcing across between poles or the union of arcs at different poles at the moment the circuit is ruptured.

The operation is as follows:

lith the circuit breaker structure in circuit closing position as indicated in Figs. l and 3, upon overload .in either of the branches of the circuit including the .poles A or C, the armature 28 `of the corresponding magnet is attracted, moving upwardly the associated member 33 which carries up wardly with it also one end of the tripper bar 35, which in such upward movementat its one end moves about the pivot pin 34 at its opposite end. This upward movement of the bar 35 causes counter-.clockwise movement of theV latch actuator 47, as viewed in Figs. l and 3, the lat-ch actuator. in turn engaging and moving the tail 41 of the latch 39, moving the latch in opposition to spring 44 to disengage from theabutment 45, which is in fixed relation to all the toggle members. Soon after the disengagement of the latch 39 from the member 45 the tail 40 of .the latch 39 engages the tail 13b of the toggle link l1, causing said toggle link to move in counterclockwise direc-tion, as viewed in Fig. l. At the same time the .upper end of the member in the outside pole, moving .upwardly by the action of the overload armature, engages the tail 13b of toggle link 11 of the` associated pole. Thus, two of the toggle members vare given motion in counterclockwise direction, the remaining pole or poles. partaking of the same movement, the toggles being actuated from overtravelled to undertravelled position, whereupon they all collapse and the cont-act members 4 move to open circuit position, either under the infiuenc'e of resilience'of the contact members 4alone, or assisted ;by gravity o-r a spring, not shown? '1.Y i f n .If the ,armatures 290i both poles A and` C should besimultaneously attracted, the san'iefmode ot operating prevails in thatV the bar'35 lirst causes disengagement of latch V39 Vfrom member 45, andtherea'tter the mem- Vvbers 33 of bothY poles Arand C Vactuate the toggles to carry them from overtravelled to undertravelled position.

Tiththe parts in open circuit position, as indicated in Fig. 5, the circuit breaker may aga-in be closed by lirst rotating Vthe handleV 61 inl clockwise direction, as viewed in Fig. 9 causing Ythe lower lug 60ct'Y the actuator .5S-.top engage the under side ot-the operating lever 36, rotating the same in counterclockwise direction as viewed in Fig. 5, until thelatch 39 engages'the abutment 45. Thereafter, th'el handle 61 is rotated in op-` positedirection, whereuponthe upper lug "59 of the actuator 58 engages upon the top of member 37 orl the 'operating lever 3S,

Ymoving-such lever in clockwise direction. as Vviewed in Fig. 5, th-e hook 59^then causing Vthe bar V14 and theseveral toggle members 11 to rotate in clockwise direction, expanding thetoggles andcarrying the contact mem- -bers 4 toward circuit closing-position, which Y they'reach -lulhenthe toggles are tullyextende-d, and slightturther vmovement causes their overtra-vel to lockthe contact members ing upward .movement of the tripping bar 35,:ivhich then causes actuation or' the latch 39`through the medium of the latch actuator 47'jthe latch 39 being thereby disengaged from' the abutment 45, thereby disconnectvingthe operating lever36 trom the toggle mechanisms, leaving them' tree to collapse and return, the contact members 4 to lopen" circuit position, andv so effecting the nonclosable function.

In event that the voltage upon the circuit becomes low or'vanishes, the attraction Vof the polesv 49 or' the low voltage magnet upon the armature 50 diminishes to such extent that thespri'ng 52 gains control of the Vlever 51, rotating it in `counter-clockwisev direc- Vtionaboutiltspivot 46, as viewed in Fig' 1,

whereuponthe pin 54 Vwill engage the cam "member 55, rotating itV in clockwise vdirection,V causingit to? thrust upwardly upon thefoperatinglever :36, -which then rotates in Y a.. counter-clockwise direction, and .the upper edge lor tace ot the lever 36 engages a reclosing the circuit Vbreaker mechanism by rotation of the handle 61 in counter-clockwise direction as Vviewed in Fig. 2, the actuator 58 by its upper lug 59 depresses the operating lever 36, which thenpresses upon the outer end ot the .cam 35, which in turn by another portion thereof engages the pin 54 and rotates the lever 51,

-inA opposition` to spring 52, to position bringing the armature 50 close to the poles 49 ot the low voltagemagnet, Ywhich, lit there is voltage of suiiicient magnitude upon the circuit, will then attract and hold the armature 50 Vin the` position indicated in Fig. 1. A -V lhat l claim is :V i Y 1. Circuit breaker mechanism comprising `a movable contact member, an overtrav'elling toggle tor moving said contact member to and restraining it in normal position, an independently movable operating Vmember, and a latch'fcrming a detachable connection .between saidoperating member andsaid toggle. Y Y Y. n l `1 '2; Circuit'breaker'mechanism comprising a movable contactV member, an overtravelf kling toggle for moving saidV contact memberV to Vand restraining it in normal position, an independently movable operating member, a latch forming a detachable connection betweensaid operating member and said toggle, and electro-responsive means for moving said toggle to undertravelled position and for actuating'said latclitoy disengage saidoperating member from saidtoggle. Y Y y3. Circuit breaker `mechanism comprising a movable Contact member-,an overtravelz ling toggle for moving said contact member vto and restrainingvit innormal positioman independently movableV Voperating member, a latch forming a detachable connection between said operating member and said toggle, Vand electro-responsive means for actuating said latch to disengage said operating member from said toggle and'jfor there,- atterinoving said toggle fromV overtravelled to undertravelled position.

4. Circuit breaker mechanism comprising a` movable contact member, anY overtravelling toggleformoving said contact'member to and restraining 1t m normal position,

an independently movable' operating rmember, a latch forming 'a detachable connec?A tion' between said operating member and said toggle,.an electrically operated member for moving said toggle from `Overtravelled Ato undertrawelledV position, vand a member carried by said elec rically operatedmember tor actuating said latch to disengage said operating member trom said toggle.

A C Cb ling toggle for moving said contact member to and restraining it in normal position, an independently movable operating member, er1-latch forming a detachable connection between said operating member and said toggle, an electrically operated member for moving said toggle. `from overtiavelled to undertravelled position, and a member pivoted upon said electrically operated member for actuating said latch to disengage said operatingmember from said toggle.

6. Circuit breaker mechanism comprising a movable contact member, an overtravelling toggle tor moving said Contact member to and restraining it in normal position,

an independently movable operating member, a latch forming a detachable connection between said operating meniber and said toggle, an electrically operated member ior Vnioving said toggle from overtravelled to under-travelled position, a member carried by said electrically operated member, and a latch actuator actuated by said last named member for actuating said latch to disengage said operating member from said togqlc.

, Circuit breaker mechanism comprising a movable contact member, an overtravelling toggle for moving said contact member to and restraining it in normal position, an independently movable operating member, a latch forming a detachable kconnection between saidoperating member and said toggle, an electrically operated member for moving said toggle from overtravelled to undertravelled position,'a member pivoted upon said electrically operated member, and a latch actuator actuated by said lastnamed member tor actuating saidlatch to disengage said operating member from said toggle.

S. Circuit breaker mechanism comprising a plurality ot movable contact members, an overtravelling toggle for each of ,said contact members :tor moving it to and restrainingV it in normal position, an operating member common to said toggles, a latch forming va detachablev connection between said operating member and said toggles, a plurality otelectrically operated members operative independently of each other to move said toggles from overtravelled to undertravelled position, and a tripping membercarried byv said electrically operated members for actuating said latch.

9. Circuit breaker mechanism comprising a plurality of movable contact members, an overtravelling toggle for each of said contact members for moving it to and restraining it in normal position,v anv operating. member common to said teggles, a. latch` forming a detachable connection between said operating member and said toggles, a

plurality ot' electrically operated members operative independently oit' each other to move said toggles trom overtravelled to. unf

dertravelled position, and a tripping mem-`v bei' carried by said electrically operated members for actuating said latch in advance oit movement ot said toggles to undertravelled position. v

l0. Circuit breaker mechanism compris,-4 ing a plurality ot movable contact members, an overtravelling toggle t'or each of ysaid contactmcmbers for moving it to and restraining it in normal position, an operating member common to said toggles, a latch forming a detachable connection between said operating member and said toggles, a plurality ot electrically operated members operative independently ot each other to move said toggles from overtravelled to undertravelled position` and a tripping member pivoted upon said electrically operated members and moved by either Vot said electrically roperated members with pivotal movement upon the other for actuatingesaid latch to disengage said operating member from said toggles,

ll. Circuit breaker mechanism compris-v ing a plurality of movable contact members, an overtravelling toggle for each of said contact members for moving it to and restraining it in normal position, an operating member common to said toggles` a latch forming a detachable connection between; said voperating member and said toggles, a plurality independently' of each other to move vrsaid toggles from overtravelled to undertravelled position, and a tripping member pivoted upon said electrically operated members for actuating said latch.

l2. Circuit breaker mechanism .comprisf ing a plurality ot movable contact members, an overtravelling toggle for each of said contactmembers for moving it to and restraining it in normal position, an operatingmember common to said toggles, a latch forming a detachable connection between said operating member and said toggles, a plurality of electrically ope 'ated members roperative independently ot each other to move said toggles from overtravelled to undertravelled position, a tripping member carriedby Said electrically operated members for actuating said latch, and a latchactuator actuated by said tripping member for actuating said latch to disconnect said voperating member trom said toggles. 13. Circuit breaker mechanism comprising a movable contact member, an overtravelling toggle for moving said contact member to and restraining it in normal position.

an independently'movable operating meinber, a latch forming a detachable connection between said operating member and said toggle, a low voltage magnet having: a normally attracted armature, means for moving sa-id Varmature to unattracted position, and means whereby said lastnamed means actuate said 'operating member to disengage said latch and thereafter to move said toggle from overtravelled to undertravelled position.

Y 14. Circuit breaker mechanism comprising a movable contact member, an overtravellingtoggle for moving said contact mem- ,ber to land Yrestraining it in normal position, Y

an lindependently movable operating' membei', a latch forming a ldetachable connection between said operating member and said.

toggle, Aa low voltage magnet having a nor- .inally attracted armature, means for mov-V ing said armature to unattracted position, and a member vactuatedV by-said means and` Vactuating said operating member to move said toggle from overtravelled to undertravelled position.

l5. Circuit breaker ing a movable contact member, an overtrav- Velling toggle for moving said contact member to'and restraining it in normal position,

-- an independently movable o'peratinganember, a latch forming a detachable connection between said operating member and said toggle, a housing enclosing the aforesaid mecha- Y' nism,`an-actuator carried by said4 housing 1- Within the same in detached relation to said.

operating member, andl means external 'to' said housing'for actuating said actuator for actuating said operating memberin one ,direction for causing saidlatch to connect said operating member; with'said toggle, vand '.in

Y iiig it in normal position, an operating membercommon to said toggles, `a latch forming a'detachable connection between said operating member and said toggles, a plurality ofielectrically operated members operative independently of each other to move saidY 5 toggles fromr'overtravelledto undertravelled Y position, a tripping member carried bysaid electrically operatedV membersV for actuating said' latch,'a vhousing enclosing the aforesaid mechanism, anV actuator carried Vby and disposedwithin said housing in detached 'relaftion to said operatingV member, and means external to said housing for moving said actuator in opposite directions for causing `said1latch to connect said operatingmember withsaidtoggles and for moving said oper-f mechanism compris member.

ating member lto vexpand said togglesl and f carry them to overtravelled position. Y

17. Circuit breaker mechanism Vcomprising a movable contact member, an overtravelling toggle for movingY said contact member to and restraining it in normal position, an independentlymovable operating memberfa Y latch forming a detachable connection tween said operating member'and said tog-V gle, a low voltage magnet havinga Vnormally attracted armature, Ameans 'for moving said armature to unattracted position, a member actuated by said means land actuating said operating member to move saidl toggle from oveitravelled to undertravelled position, a housing enclosing the aforesaid mechanism, an actuator carried by said housing within the same in detached Irelation to said operating membeig'and means external to said housing for moving said actuator to engage and move said operating member to move said armature toward attracted position.

, 18t Circuit breakeiinechanism comprising a movable contact member, means for restraining it in normal position, an independently movable operating member, a latch Y forming a detachable connection between said operating member and said movable contact member, an electrically operated member for actuating said restraining means to free said contact member, and a member carried by said electrically `operated meni-V bei' for actuating said latch to disengage said operating member from said Ymovable confV tact.V member. Y

19. -Circuit breaker mechanism comprising Y a movable contact member, means for 're-1 straining it in normal position, an independ. ently movable operating member, a 'latch `forming a detachableconnection between said operating member and said movable Contact member, an electrically operated member for .actuating said restraining means to free said contact member, anda member pivoted upon said electrically opeiated member for actuating said latch to movable contact member.

20. Circuit breaker mechanism compris-1 ing a movable contact member, means for 're straining it in normal position, an independently movable operating member, a latch forming. a detachable connection between said operating member and said movablev contact member, an electrically operated'member for actuating said restraining means to free said contact member, a member carried by-'said electrically operated member, and a latch actuator actuated by said last named inem- Vber for actuating said latch yto disengage said operating Ymembertromfsaid contact 21.'Circuit breaker mechanism comprising a plurality of movable contact members,

i Vdisengage said operating memberfrom said means for restraining them in normal position, an operating member common to said contact members, a latch forming a detachable connection between said operating member and said contact members, a plurality of electrica ly operated members operating independently ot each other to actuate said restraining means, and a tripping member carried by said electrically operated members for actuating said latch.

29.. Circuit breaker mechanism comprising a plurality ot' movable contact members, means for restraining them in normal position, an operating member common to said contact members, a latch forming a detachable connection between said operating member and said contact members, a plurality of electrically operated members operating independently ot each other to actuate said restraining means, and a tripping member pivoted upon said electrically operated members and moved by either ot' them with pivotal movement upon the other for actuating said latch.

23. Circuit breaker meciianism comprising a plurality of movable contact members, means for restraining them in normal position, an operating member common to said contact members, a latch forming a detachable connection between said operating member and said contact members, a plurality of electrically operated members operating independently of each other to actuate said restraining means, and a tripping member piv. oted upon said electrically operated members i'or actuating said latch.

24. Circuit breaker mechanism comprising a plurality of movable Contact members,

. means for restraining` them in normal position, an operating member common to said contact members, a latch forming a detachable connection between said operating member and said contact members, a plurality of electrically operated members operating independently of each other to actuate said restraining means, a tripping member carried by said electrically operated members, and a latch actuator actuated by said tripping member for actuating said latch.

25. Circuit breaker mechanism comprising a movable contact member, an overtravelling toggle for moving said contact member to and restraining it in normal position, a pivoted operating member movable independently of said toggle, a latch pivoted on said operating member and vforming a disengageable connection between it and said toggle, electro-magnetic means for actuating said latch, and means on said latch for engaging and actuating said toggle.

26. The combination witlra` plurality of movable Contact members, ot' means for causing their movement in unison with each other, means for restraining said contact members in normal position, an independently movable operating member, a latch forming a detachable connection between said operating member and said movable contact members, electro-magnetic means for actuating said latch, and electro-magnetic means for actuating said operating member.

27. The combination with a plurality of movable contact members, of means for causing their movement in unison with each other, means for restraining said contact members in normal position, an independently movable operating member, a latch carried by said operating member and forming a detachable connection between it and said contact members, electro-magnetic means for actuating said latch, and electro-magnetic means for actuating said operating member.

28. Circuit breaker mechanism comprising a movable contact member, means for restraining it in normal position, an independently movable Operating member, a latch forming a disengageable connection between said operating member and said contact member, electro-magnetic means for actuating said latch, and electro-magnetic means for actuating said operating member.

29. Circuit breaker mechanism comprising a movable contact member, means for restraining it in normal position, an independently movable operating member, a latch carried by said operating member and forming a detachable connection between it and said contact member, electro-magnetic means for actuating said latch and electromagnetic means t'or actuating said operating member to free said contact member from said latch and for actuating said restraining means.

In testimony whereof I have hereunto affixed my signature this 15th day of February, 1923.

JAMES H. WYATT. 

